/* Ouroboros project site — shared design tokens and components.
   Same visual language as the project's Claude Artifact postmortems,
   reused here so the GitHub Pages site and those pages read as one
   consistent series. */

:root {
  --paper: #eef0f3;
  --surface: #ffffff;
  --ink: #1b1e26;
  --ink-soft: #4d5566;
  --wire: #d7dbe2;
  --wire-strong: #b9c0cc;
  --amber: #b95f1f;
  --amber-soft: #f3e3d3;
  --panel-bg: #11141b;
  --panel-text: #d7dce6;
  --panel-dim: #7b8496;
  --panel-amber: #e5a25c;
  --panel-border: #2a2f3c;
  --focus: #b95f1f;

  --font-mono: ui-monospace, "SF Mono", "Cascadia Code", "JetBrains Mono", Menlo, Consolas, monospace;
  --font-serif: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Georgia, serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #10131a;
    --surface: #171b25;
    --ink: #e7e6e0;
    --ink-soft: #a3aab8;
    --wire: #2a2f3c;
    --wire-strong: #3a4152;
    --amber: #e5a25c;
    --amber-soft: #2c2214;
    --panel-bg: #0b0d13;
    --panel-text: #d7dce6;
    --panel-dim: #6b7386;
    --panel-amber: #e5a25c;
    --panel-border: #262b38;
    --focus: #e5a25c;
  }
}

* { box-sizing: border-box; }

html { background: var(--paper); }

body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-serif);
  font-size: 18px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  margin: 0;
}

::selection { background: var(--amber-soft); color: var(--ink); }

a { color: var(--amber); text-decoration-thickness: 1px; text-underline-offset: 2px; }
a:focus-visible, button:focus-visible { outline: 2px solid var(--focus); outline-offset: 2px; }

/* ---------- top nav ---------- */

.sitenav {
  position: sticky;
  top: 0;
  z-index: 10;
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--wire);
}
.sitenav-inner {
  max-width: 780px;
  margin: 0 auto;
  padding: 0.9rem 1.5rem;
  display: flex;
  align-items: center;
  gap: 1.4rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
}
.sitenav-mark {
  font-weight: 700;
  color: var(--ink);
  text-decoration: none;
  letter-spacing: 0.02em;
}
.sitenav-links {
  display: flex;
  gap: 1.1rem;
  flex-wrap: wrap;
  margin-left: auto;
}
.sitenav-links a {
  color: var(--ink-soft);
  text-decoration: none;
}
.sitenav-links a:hover, .sitenav-links a.current { color: var(--amber); }
.sitenav-links a.current { font-weight: 700; }

@media (max-width: 560px) {
  .sitenav-inner { flex-wrap: wrap; gap: 0.6rem 1rem; }
  .sitenav-links { margin-left: 0; gap: 0.9rem; }
}

/* ---------- page shell ---------- */

.page {
  max-width: 700px;
  margin: 0 auto;
  padding: 4rem 1.5rem 8rem;
}

@media (max-width: 560px) {
  .page { padding: 2.5rem 1.25rem 5rem; }
  body { font-size: 16.5px; }
}

/* The logo image carries its own dark navy ground, so it reads as a
   deliberate badge on both themes - the border keeps its edge defined
   against the dark theme's paper. */
.hero-logo {
  display: block;
  width: 150px;
  height: 150px;
  border-radius: 18px;
  border: 1px solid var(--wire);
  margin-bottom: 1.4rem;
}

.kicker {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--panel-dim);
  display: flex;
  align-items: center;
  gap: 0.6em;
  margin-bottom: 1.6rem;
}
.kicker::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--wire-strong);
}

h1.title {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(1.9rem, 5vw, 2.6rem);
  line-height: 1.14;
  letter-spacing: -0.01em;
  text-wrap: balance;
  margin: 0 0 1.1rem;
  color: var(--ink);
}
h1.title.small { font-size: clamp(1.7rem, 4.6vw, 2.3rem); line-height: 1.16; }

p.dek {
  font-size: 1.15rem;
  color: var(--ink-soft);
  max-width: 34em;
  margin: 0 0 2.4rem;
}

/* bit-strip motif */
.bitstrip {
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  gap: 3px;
  margin: 0 0 2.8rem;
  animation: reveal 700ms ease-out both;
}
.bitstrip .bit {
  height: 26px;
  border-radius: 2px;
  background: var(--surface);
  border: 1px solid var(--wire);
  position: relative;
}
.bitstrip .bit.on { background: var(--amber-soft); border-color: var(--amber); }
.bitstrip .bit .val {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 0.62rem;
  color: var(--panel-dim);
}
.bitstrip .bit.on .val { color: var(--amber); font-weight: 600; }
.bitstrip-caption {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--panel-dim);
  letter-spacing: 0.04em;
  margin: 0.5rem 0 0;
}

@keyframes reveal {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}
@media (prefers-reduced-motion: reduce) {
  .bitstrip { animation: none; }
}

/* ---------- trilogy nav ---------- */

.trilogy {
  display: flex;
  gap: 0.5rem;
  margin: 0 0 1.5rem;
}
.trilogy a {
  flex: 1;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-align: center;
  padding: 0.6rem 0.4rem;
  border-radius: 6px;
  border: 1px solid var(--wire);
  color: var(--ink-soft);
  text-decoration: none;
  background: var(--surface);
}
.trilogy a.current {
  border-color: var(--amber);
  color: var(--amber);
  font-weight: 700;
  background: var(--amber-soft);
}
.trilogy a:hover:not(.current) { border-color: var(--wire-strong); color: var(--ink); }

/* ---------- prose ---------- */

article h2 {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 1.22rem;
  letter-spacing: -0.005em;
  text-wrap: balance;
  color: var(--ink);
  margin: 3.2rem 0 1.1rem;
  padding-top: 2.1rem;
  border-top: 1px solid var(--wire);
  scroll-margin-top: 4.5rem; /* anchored jumps clear the sticky nav */
}
article > h2:first-of-type { border-top: none; padding-top: 0; }

article h3 {
  font-family: var(--font-serif);
  font-style: italic;
  font-weight: 600;
  font-size: 1.08rem;
  color: var(--ink);
  margin: 2rem 0 0.75rem;
}

article p { margin: 0 0 1.15rem; }
article ul, article ol { margin: 0 0 1.15rem; padding-left: 1.3rem; }
article li { margin-bottom: 0.5rem; }

article strong { color: var(--ink); font-weight: 700; }
article em { color: var(--ink); }

code.inline {
  font-family: var(--font-mono);
  font-size: 0.86em;
  background: var(--surface);
  border: 1px solid var(--wire);
  border-radius: 4px;
  padding: 0.1em 0.35em;
  color: var(--amber);
  white-space: nowrap;
}

blockquote.aside {
  margin: 1.6rem 0;
  padding: 1.1rem 1.3rem;
  background: var(--surface);
  border: 1px solid var(--wire);
  border-left: 3px solid var(--wire-strong);
  border-radius: 6px;
  font-size: 0.95rem;
  color: var(--ink-soft);
}
blockquote.aside p:last-child { margin-bottom: 0; }
blockquote.aside .aside-label {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--panel-dim);
  display: block;
  margin-bottom: 0.6rem;
}

/* ---------- terminal / register panels ---------- */

.panel {
  background: var(--panel-bg);
  border: 1px solid var(--panel-border);
  border-radius: 8px;
  margin: 1.4rem 0 1.7rem;
  overflow: hidden;
  box-shadow: 0 1px 0 rgba(0,0,0,0.02);
}
.panel-tab {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--panel-dim);
  padding: 0.55rem 0.9rem;
  border-bottom: 1px solid var(--panel-border);
  display: flex;
  justify-content: space-between;
}
.panel pre {
  margin: 0;
  padding: 0.95rem 1.1rem 1.1rem;
  overflow-x: auto;
}
.panel code {
  font-family: var(--font-mono);
  font-size: 0.83rem;
  line-height: 1.65;
  color: var(--panel-text);
  font-variant-numeric: tabular-nums;
  white-space: pre;
}
.panel .hl { color: var(--panel-amber); font-weight: 600; }
.panel .dim { color: var(--panel-dim); }
.panel .bad { color: #d97878; }
.panel .good { color: #7ec8a9; }

/* ---------- numbered bug list ---------- */

ol.bugs { list-style: none; padding-left: 0; counter-reset: bug; }
ol.bugs > li {
  counter-increment: bug;
  position: relative;
  padding-left: 3.1rem;
  margin: 0 0 2.1rem;
}
ol.bugs > li::before {
  content: counter(bug, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 0.05em;
  font-family: var(--font-mono);
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--amber);
  letter-spacing: 0.02em;
}
ol.bugs > li > strong.bug-title {
  display: block;
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 0.35rem;
  font-size: 1.02rem;
}

/* ---------- lesson callouts ---------- */

.lesson {
  margin: 1.5rem 0 0;
  padding: 1rem 1.2rem;
  background: var(--amber-soft);
  border-radius: 6px;
  font-size: 0.95rem;
}
.lesson .lesson-label {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--amber);
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 700;
}
.lesson p { margin: 0; color: var(--ink); }
.lesson.mystery { background: var(--surface); border: 1px dashed var(--wire-strong); }
.lesson.mystery .lesson-label { color: var(--ink-soft); }

/* ---------- generalized techniques list ---------- */

.techniques { padding-left: 0; list-style: none; }
.techniques li {
  padding: 0.9rem 0 0.9rem 1.6rem;
  border-top: 1px solid var(--wire);
  position: relative;
}
.techniques li:last-child { border-bottom: 1px solid var(--wire); }
.techniques li::before {
  content: "▸";
  position: absolute;
  left: 0;
  color: var(--amber);
  font-size: 0.85em;
  top: 1.05rem;
}

/* ---------- companion link ---------- */

.companion {
  margin: 0 0 2.6rem;
  padding: 0.95rem 1.15rem;
  border: 1px solid var(--wire);
  border-radius: 6px;
  font-size: 0.9rem;
  color: var(--ink-soft);
  display: flex;
  gap: 0.7rem;
  align-items: baseline;
}
.companion .companion-icon { font-size: 1.1rem; }
.companion a { font-weight: 600; }

/* ---------- landing-page-only components ---------- */

.hero-links {
  display: flex;
  gap: 0.8rem;
  flex-wrap: wrap;
  margin: 0 0 3rem;
}
.hero-links a {
  font-family: var(--font-mono);
  font-size: 0.84rem;
  text-decoration: none;
  padding: 0.7rem 1.1rem;
  border-radius: 6px;
  border: 1px solid var(--wire-strong);
  color: var(--ink);
  background: var(--surface);
}
.hero-links a.primary {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--paper);
}
@media (prefers-color-scheme: dark) {
  .hero-links a.primary { background: var(--amber); border-color: var(--amber); color: #12130f; }
}
.hero-links a:hover { border-color: var(--amber); }

.stat-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 1px;
  background: var(--wire);
  border: 1px solid var(--wire);
  border-radius: 8px;
  overflow: hidden;
  margin: 0 0 3rem;
}
.stat {
  background: var(--surface);
  padding: 1rem 1.1rem;
}
.stat .stat-num {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--amber);
  display: block;
  font-variant-numeric: tabular-nums;
}
.stat .stat-label {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--panel-dim);
}

.postmortem-cards {
  display: grid;
  gap: 1rem;
  margin: 0 0 1rem;
}
.pm-card {
  display: block;
  padding: 1.3rem 1.4rem;
  border: 1px solid var(--wire);
  border-radius: 10px;
  background: var(--surface);
  text-decoration: none;
  color: var(--ink);
  transition: border-color 120ms ease;
}
.pm-card:hover { border-color: var(--amber); }
.pm-card .pm-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--amber);
  display: block;
  margin-bottom: 0.5rem;
}
.pm-card h3 {
  font-family: var(--font-mono);
  font-style: normal;
  font-size: 1.08rem;
  margin: 0 0 0.5rem;
  color: var(--ink);
}
.pm-card p {
  margin: 0;
  font-size: 0.92rem;
  color: var(--ink-soft);
}

.timeline {
  list-style: none;
  padding: 0;
  margin: 0 0 2rem;
  border-left: 2px solid var(--wire);
}
.timeline li {
  position: relative;
  padding: 0 0 1.7rem 1.5rem;
}
.timeline li::before {
  content: "";
  position: absolute;
  left: -6.5px;
  top: 0.3em;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--surface);
  border: 2px solid var(--amber);
}
.timeline li.done::before { background: var(--amber); }
.timeline .tl-title {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 0.98rem;
  color: var(--ink);
  display: block;
  margin-bottom: 0.25rem;
}
.timeline p { margin: 0; color: var(--ink-soft); font-size: 0.93rem; }

/* ---------- glossary ---------- */

.glossary-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 0 0 2.6rem;
}
.glossary-jump a {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  text-decoration: none;
  padding: 0.45rem 0.8rem;
  border-radius: 999px;
  border: 1px solid var(--wire);
  color: var(--ink-soft);
  background: var(--surface);
}
.glossary-jump a:hover { border-color: var(--amber); color: var(--amber); }

.glossary-group h2 { margin-top: 3rem; }
.glossary-group:first-of-type h2 { margin-top: 0; border-top: none; padding-top: 0; }

dl.terms { margin: 0 0 1rem; }
dl.terms dt {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1rem;
  color: var(--ink);
  margin: 1.5rem 0 0.35rem;
  scroll-margin-top: 5.5rem;
}
dl.terms dt:first-of-type { margin-top: 0; }
dl.terms dt .term-full {
  font-family: var(--font-serif);
  font-weight: 400;
  font-style: italic;
  color: var(--ink-soft);
  font-size: 0.82em;
  margin-left: 0.55em;
}
dl.terms dd {
  margin: 0 0 0;
  color: var(--ink-soft);
  font-size: 0.96rem;
  max-width: 34em;
}

/* ---------- footer ---------- */

footer.site-footer {
  margin-top: 4rem;
  padding-top: 1.6rem;
  border-top: 1px solid var(--wire);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--panel-dim);
  letter-spacing: 0.02em;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.6rem;
}
footer.site-footer a { color: var(--panel-dim); }
footer.site-footer a:hover { color: var(--amber); }